For Insta360 X4air Clip-on Glass Protective Lens Material: Optical tempered glass, coated with anti-reflective, anti-fog, and anti-water-slip film, further hardened. Functions: Scratch-resistant, anti-fog, waterproof, dustproof, deformation-resistant, high-temperature resistant. 1. Made of optical tempered glass with a hardness of 9H. Optical tempered glass is about ten times harder than plastic protective lenses. Plastic faces typically have a hardness of around 1H, while tempered glass reaches 9H or greater! No more fear of scratches; more dependable than plastic protective lenses, with better light transmission. 2. The lens material has a light transmittance of nearly 95%, and an for AR coating layer further increases the light transmittance to over 98%. 3. The lens has a waterproof coating with a drip angle of 115 degrees, preventing water droplets from remaining on the lens face and affecting shooting results. 4. It uses a snap-on installation method, making installation and removal simple and convenient. Hardness: 9H Lens Material: Optical Tempered Glass Light Transmittance: 99% Other Materials: High-Quality PC Dimensions: 54*47*47mm Packaging Dimensions: 5.2*5*5cm Net Weight: 14g Packaged Weight: 26g Product Includes: 1 snap-on protective lens, 1 instruction manual, 2 packs of alcohol swabs Packaging: Color box packaging